April 2014 - Boost-users - lists.boost.org

[Interprocess] Named objects with 'Managed External Buffer' (newbie)
by Jorge Bellon 25 Apr '14

25 Apr '14

Good afternoon, First, I apologize if I'm asking something obvious or outside the acceptable topics. I'm starting to use Boost so I'm quite newbie. I'm interested in using the managed_external_buffer in order to perform buffer copies into a created buffer that was created previously. Therefore, I will be storing mostly raw data into that buffer. Basically, I'm trying to do the following: Suppose a program uses the following int array: int numbers[10] = { 0, 1, 2, 3, 4, 5, 6, 7, 8, 9 }; Eventually, I have to copy a chunk of that array into a pre-allocated buffer (i.e. the managed_external_buffer). Let the chunk be defined with: typedef struct { void* addr; size_t size; } chunk_t; However, these chunks can overlap, so I will sometimes merge two overlapping chunks into a bigger one. Example: // Chunk 1 chunk1_addr = (void*)&numbers[3]; chunk1_size = 3 * sizeof(int); // Chunk 2 chunk2_addr = (void*) &numbers[4]; chunk2_size = 4 * sizeof(int); The desired result is a single chunk containing {3, 4, 5, 6, 7}. The proposed problem is the merge, but how to find those chunks in the managed_external_buffer, so my question is the following: - Would it be possible to use named objects with another data type other than CharType and use managed_external_buffer::find to look for them? The thing is I could generate a hash or a numerical ID to identify the chunk. Generating a string using that number could be done but it would not be efficient. Otherwise, I guess I would have to keep a map (or other collection) with the <chunk ID, chunk pointer> pairs, define the managed_external_buffer with boost::interprocess::null_index (since I won't be using named objects) and use it through allocate and deallocate. Is this correct? Thanks in advance, Jorge WARNING / LEGAL TEXT: This message is intended only for the use of the individual or entity to which it is addressed and may contain information which is privileged, confidential, proprietary, or exempt from disclosure under applicable law. If you are not the intended recipient or the person responsible for delivering the message to the intended recipient, you are strictly prohibited from disclosing, distributing, copying, or in any way using this message. If you have received this communication in error, please notify the sender and destroy and delete any copies you may have received. http://www.bsc.es/disclaimer

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[msm] compilation warning with boost-1.55.0
by samriti katoch 25 Apr '14

25 Apr '14

Hi, With boost-1.55.0 I see this warning from msm code: In file included from /build/boost/fusion/include/make_map.hpp:10, from /build/boost/msm/front/euml/common.hpp:40, from /build/boost/msm/front/euml/operator.hpp:15, from /build/abc.cc:15: cc1plus: warnings being treated as errors /build/boost/msm/back/fold_to_list.hpp:35: warning: 'boost::msm::back::states_' defined but not used What is a good way to remove this warning? Thanks! Samriti

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Free Workshop: Test-Driven Development in C++ (Salt Lake City, UT)
by legalize+jeeves＠mail.xmission.com 25 Apr '14

25 Apr '14

[Please do not mail me a copy of your followup] This will be a practice run of my presentation for C++ Now! 2014. Workshop announcement: <http://bit.ly/RQgOtQ> Excerpt from the announcement: Test-Driven Development in C++, Wednesday, April 30, 2014 Have you heard about that new thing the kids are doing called test-driven development and wondered what it's all about? Is it about testing? Is it about design? Is it good or is it bad? Come join me for an evening workshop where I will show you what it's all about and you'll have a chance to try it out for yourself on a problem large enough to be interesting, but small enough that you can make progress on it during the workshop. The workshop will use the Boost.Test and Turtle libraries. Thanks to Fusion-io for the meeting facilities, WiFi access, food (pizza from The Pie) and refreshments. -- "The Direct3D Graphics Pipeline" free book <http://tinyurl.com/d3d-pipeline> The Computer Graphics Museum <http://computergraphicsmuseum.org> The Terminals Wiki <http://terminals.classiccmp.org> Legalize Adulthood! (my blog) <http://legalizeadulthood.wordpress.com>

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circular buffer in a multithreaded program
by Sebastian Gesemann 24 Apr '14

24 Apr '14

Hello! I had some troubles with using boost::circular_buffer in a multithreaded application and I'm not really sure whether I actually ran into a bug or wether I expected just too much that wasn't promised in the thread-safety section. Anyhow, I wanted to share my story and a theory of what possibly went wrong. Maybe this posting even contains some ideas of how circular_buffer could be made a little more thread-safe without ading any mutex- or atomics-based synchronization. What I tried to do: I tried to grant one thread write access to a sub-range in a circular_buffer while another thread had read-access to a non-overlapping sub-range. At no time any capacity change was needed. Occasionally, in a reader thread I would "consume" some of the values that were already "committed" by a writer and make more room for the writer to store new data by - locking a mutex - calling cb.erase_first(n); - calling cb.resize(cb.capacity()); - notify writer that there is new free space to write stuff into - unlocking the mutex As for iterator invalidation, erase_first just invalidates iterators to the elements being removed. And resize in this case just increases the size again to the capacity which should not invalidate any iterators If I understand correctly. But the program did not work. The first thing that came to my attention was that the checked iterators of circular_buffer don't support this kind of multithreading as they register and unregister themselves into a linked list without any synchronization. But even after disabling the checked iterators via BOOST_CB_DISABLE_DEBUG, the program still did not work. I could not figure out why (with enough certainty) and eventually replaced circular_buffer with a custom vector-based data structure. My guess is that the iterators of a circular_buffer somehow depend on some part of the state of the buffer that is modifed by erase_first. Then, I would have a data race. But such a dependency does not really have to be there. In my own implementation, an iterator is "self-sufficient" in the sense that it does not need to access any of the buffer's state (indices, counters and whatnot) to access the right elements. And this way, erasing some unneeded elements from the buffer while some other thread still works on other values in the buffer via iterators does not cause a data race. In my opinion, it's reasonable to expect something like this to work using a circular_buffer. Maybe someone knows more about how circular_buffer iterators are implemented and/or wants to improve the circular_buffer implementation w.r.t. thread-safety to support this kind of use. Since I switched to a custom data structure that is able to deal with this situation, I did not investiage this issue with circular_buffer any further. I already lost about a day because of this. I hope, this is of interest to somebody who wants to avoid exessive copying in the standard "producer-consumer / bounded-buffer pattern". Cheers! Sebastian

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Memory leak in boost::filesystems::parent_path()?
by B.W.H. van Beest 24 Apr '14

24 Apr '14

Hi, The following minimal program (only 7 lines) causes valgrind to report 2 errors, in line6: Some somebody point me to why it is wrong? a.cpp: 1 #include <boost/filesystem.hpp> 2 3 int main( int, char** ) 4 { 5 boost::filesystem::path path0( "/a/b/c" ); 6 boost::filesystem::path path1 = path0.parent_path(); 7 } Compiling and running with valgrind: g++ -g -lboost_system -lboost_filesystem a.cpp -o a.exe valgrind ./a.exe This gives the following output. Note the errors. ==13303== Memcheck, a memory error detector ==13303== Copyright (C) 2002-2012, and GNU GPL'd, by Julian Seward et al. ==13303== Using Valgrind-3.8.1 and LibVEX; rerun with -h for copyright info ==13303== Command: ./a.exe ==13303== ==13303== Invalid read of size 8 ==13303== at 0x5B0A5C8: wcscmp (in /lib64/libc-2.18.so) ==13303== by 0x52CA5C4: std::moneypunct<wchar_t, false>::~moneypunct() (in /usr/lib64/libstdc++.so.6.0.18) ==13303== by 0x52CA638: std::moneypunct<wchar_t, false>::~moneypunct() (in /usr/lib64/libstdc++.so.6.0.18) ==13303== by 0x52C1304: std::locale::_Impl::~_Impl() (in /usr/lib64/libstdc++.so.6.0.18) ==13303== by 0x52C143C: std::locale::~locale() (in /usr/lib64/libstdc++.so.6.0.18) ==13303== by 0x5AA775E: __cxa_finalize (in /lib64/libc-2.18.so) ==13303== by 0x503DD72: ??? (in /usr/lib64/libboost_filesystem.so.1.53.0) ==13303== by 0x400EE69: _dl_fini (in /lib64/ld-2.18.so) ==13303== by 0x5AA73D8: __run_exit_handlers (in /lib64/libc-2.18.so) ==13303== by 0x5AA7424: exit (in /lib64/libc-2.18.so) ==13303== by 0x5A90BEB: (below main) (in /lib64/libc-2.18.so) ==13303== Address 0x604c038 is 0 bytes after a block of size 8 alloc'd ==13303== at 0x4C284B7: operator new[](unsigned long) (in /usr/lib64/valgrind/vgpreload_memcheck-amd64-linux.so) ==13303== by 0x52CBC81: std::moneypunct<wchar_t, false>::_M_initialize_moneypunct(__locale_struct*, char const*) (in /usr/lib64/libstdc++.so.6 .0.18) ==13303== by 0x52C3807: std::locale::_Impl::_Impl(char const*, unsigned long) (in /usr/lib64/libstdc++.so.6.0.18) ==13303== by 0x52C42D1: std::locale::locale(char const*) (in /usr/lib64/libstdc++.so.6.0.18) ==13303== by 0x50451B1: boost::filesystem::path::codecvt() (in /usr/lib64/libboost_filesystem.so.1.53.0) ==13303== by 0x5046C7E: boost::filesystem::path::parent_path() const (in /usr/lib64/libboost_filesystem.so.1.53.0) ==13303== by 0x401843: main (a.cpp:6) ==13303== ==13303== Invalid read of size 8 ==13303== at 0x5B0A5C8: wcscmp (in /lib64/libc-2.18.so) ==13303== by 0x52CA4D4: std::moneypunct<wchar_t, true>::~moneypunct() (in /usr/lib64/libstdc++.so.6.0.18) ==13303== by 0x52CA548: std::moneypunct<wchar_t, true>::~moneypunct() (in /usr/lib64/libstdc++.so.6.0.18) ==13303== by 0x52C1304: std::locale::_Impl::~_Impl() (in /usr/lib64/libstdc++.so.6.0.18) ==13303== by 0x52C143C: std::locale::~locale() (in /usr/lib64/libstdc++.so.6.0.18) ==13303== by 0x5AA775E: __cxa_finalize (in /lib64/libc-2.18.so) ==13303== by 0x503DD72: ??? (in /usr/lib64/libboost_filesystem.so.1.53.0) ==13303== by 0x400EE69: _dl_fini (in /lib64/ld-2.18.so) ==13303== by 0x5AA73D8: __run_exit_handlers (in /lib64/libc-2.18.so) ==13303== by 0x5AA7424: exit (in /lib64/libc-2.18.so) ==13303== by 0x5A90BEB: (below main) (in /lib64/libc-2.18.so) ==13303== Address 0x604c268 is 0 bytes after a block of size 8 alloc'd ==13303== at 0x4C284B7: operator new[](unsigned long) (in /usr/lib64/valgrind/vgpreload_memcheck-amd64-linux.so) ==13303== by 0x52CB6B1: std::moneypunct<wchar_t, true>::_M_initialize_moneypunct(__locale_struct*, char const*) (in /usr/lib64/libstdc++.so.6. 0.18) ==13303== by 0x52C3854: std::locale::_Impl::_Impl(char const*, unsigned long) (in /usr/lib64/libstdc++.so.6.0.18) ==13303== by 0x52C42D1: std::locale::locale(char const*) (in /usr/lib64/libstdc++.so.6.0.18) ==13303== by 0x50451B1: boost::filesystem::path::codecvt() (in /usr/lib64/libboost_filesystem.so.1.53.0) ==13303== by 0x5046C7E: boost::filesystem::path::parent_path() const (in /usr/lib64/libboost_filesystem.so.1.53.0) ==13303== by 0x401843: main (a.cpp:6) ==13303== ==13303== ==13303== HEAP SUMMARY: ==13303== in use at exit: 0 bytes in 0 blocks ==13303== total heap usage: 483 allocs, 483 frees, 34,115 bytes allocated ==13303== ==13303== All heap blocks were freed -- no leaks are possible ==13303== ==13303== For counts of detected and suppressed errors, rerun with: -v ==13303== ERROR SUMMARY: 2 errors from 2 contexts (suppressed: 2 from 2)

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cmake + CUDA 6 + clang + boost errors on OS X Mavericks
by John Owens 24 Apr '14

24 Apr '14

Greetings, I’m using boost (1.55) (installed via macports) on: - OS X Mavericks - using clang (5.1, the Xcode default version, LLVM 3.4) - with CUDA 6 - and cmake (2.8.12.2). It has a large number of compile errors, shown here: http://pastebin.com/Qg2V0UwM that begin with: /opt/local/include/boost/type_traits/is_abstract.hpp(72): error: identifier "__is_abstract" is undefined I’d be delighted to have any advice on how to do cmake + CUDA 6 + clang + boost on OS X! JDO

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include error in OS X 10.9.2
by Freddy Martinez Garcia 22 Apr '14

22 Apr '14

Hi guys I’m trying to use mongodb in my develop. MongoDB use Boost library in its implementation… I had installed boost 1.55 with macport… the problem is when the mongo c++ driver import son files like: #include <boost/function.hpp> and this file does not exists in my system… How can I fix this in Mac ?? I’m new in os x, because in linux I don’t have this error… best regards freddy

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[Boost][Graph] vf2 implementation question
by Marc Viala 20 Apr '14

20 Apr '14

Hi, Recently,I tried to use Boost.Graph's VF2 implementation and after having played few days with this module, I was wondering if this implementation supports "adjacency_matrix" model as explained by the documentation (cf. http://www.boost.org/doc/libs/1_55_0/libs/graph/doc/vf2_sub_graph_iso.html) To demonstrate my point, you will find hereafter an C++ example extracted from the Boost.Graph's documentation. If the macro "ADJACENCY_LIST_STRUCT" is commented out, this code can't be compiled w/ VS2012 aka VC11 because the static assertion @line 837 of "boost/graph/vf2_sub_graph_iso.hpp" is triggered. My questions are: - Does this VF2 implementation supports "adjacency_matrix" model? - Is there any patch for supporting this model of graph? FYI: If I comment two static assertations in file "boost/graph/vf2_sub_graph_iso.hpp", at line 837 and line 843, the code compiles and runs correctly for "adjacency_matrix" model. #include <boost/graph/adjacency_list.hpp> #include <boost/graph/adjacency_matrix.hpp> #include <boost/graph/vf2_sub_graph_iso.hpp> using namespace boost; //#define ADJACENCY_LIST_STRUCT int main() { #ifdef ADJACENCY_LIST_STRUCT typedef adjacency_list<vecS, vecS, undirectedS> graph_type; #else typedef adjacency_matrix<undirectedS> graph_type; #endif // Build graph1. const int num_vertices1 = 8; graph_type graph1(num_vertices1); add_edge(0, 6, graph1); add_edge(0, 7, graph1); add_edge(1, 5, graph1); add_edge(1, 7, graph1); add_edge(2, 4, graph1); add_edge(2, 5, graph1); add_edge(2, 6, graph1); add_edge(3, 4, graph1); // Build graph2. const int num_vertices2 = 9; graph_type graph2(num_vertices2); add_edge(0, 6, graph2); add_edge(0, 8, graph2); add_edge(1, 5, graph2); add_edge(1, 7, graph2); add_edge(2, 4, graph2); add_edge(2, 7, graph2); add_edge(2, 8, graph2); add_edge(3, 4, graph2); add_edge(3, 5, graph2); add_edge(3, 6, graph2); // Compute de subgraph isomorphing. vf2_print_callback<graph_type, graph_type> cb(graph1, graph2); vf2_subgraph_iso(graph1, graph2, cb); } Best regards, Marc

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[Iostream] how to build iostream with zlib on windows
by Pritesh Acharya 18 Apr '14

18 Apr '14

Boost version: 1.55.0 OS: Windows 8 IDE: Visual Studio 2010 Is there a good tutorial on building boost iostream with zlib on windows. I looked over reference manual but with no solution. I did download zlib dll and source code and made reference in visual studio. I have link error on gzip_decompressor();

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Using metric_tsp_approx with bundled properties
by Alexis Praga 18 Apr '14

18 Apr '14

Hi, I am trying to use metric_tsp_approx on a graph defined as : typedef adjacency_list<vecS, vecS, undirectedS, City, Road> Graph; City contains the vertex id and Road the edge weight. After reading the documentation, I arrived to : metric_tsp_approx(g_init, weight_map(get(&Road::length, g_init)). vertex_index_map(get(&City::id, g_init)), make_tsp_tour_visitor(back_inserter(c))); I have compilation errors however. The relevant part seems to be : /usr/include/boost/property_map/property_map.hpp:382:58: error: no type named ‘key_type’ in ‘struct boost::property_traits<boost::bgl_named_params<boost::bundle_property_map<boost::adjacency_list<boost::vecS, boost::vecS, boost::undirectedS, City, Road>, long unsigned int, City, int>, boost::vertex_index_t, boost::no_property> >’ Any help appreciated, thanks. -- Alexis Praga, PhD Student (CERFACS) GPG key : AD4A AF6D BB5C 042F 9422 1223 06E1 C1BF E287 65D0

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[asio]Does the function of async_read can find the tcp connection has closed?
by lx 18 Apr '14

18 Apr '14

hi all: I want to know async_read or async_write can detect the tcp connection has closed, or not? thank you

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[container] header reference for most containers is unavailable in Boost 1.55
by Adam Romanek 17 Apr '14

17 Apr '14

Hi! there's a problem with the documentation of most containers from Boost.Container in Boost 1.55. The problem is that hyper-links seem to be missing, i.e. I can't click on deque, list or map. However, the links to the reference of vector or string are fine... WBR, Adam Romanek [1] http://www.boost.org/doc/libs/1_55_0/doc/html/boost_container_header_refere…

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boost serialize issue when compile 64 bit application
by gary jiang 17 Apr '14

17 Apr '14

Hi all, I am compiling 64 bit application, and got lots of errors about boost serializer, but I don't have any issue when compile 32 bit application. Is there some attention when transform from 32 bit boost to 64 bit boost? Any advice would be appreciate, thanks in advance! PS: We used intel toolchain to compile boost, and tried with different boost version, still got same errors. Regards, Gary Main.o: In function `boost::archive::detail::iserializer<CMyText_iarchive, AtworkPathInfo>::load_object_data(boost::archive::detail::basic_iarchive&, void*, unsigned int) const': Main.cpp:(.text._ZNK5boost7archive6detail11iserializerI16CMyText_iarchive15AtworkPathInfoE16load_object_dataERNS1_14basic_iarchiveEPvj[_ZNK5boost7archive6detail11iserializerI16CMyText_iarchive15AtworkPathInfoE16load_object_dataERNS1_14basic_iarchiveEPvj]+0x4b): undefined reference to `void AtworkPathInfo::serialize<CMyText_iarchive>(CMyText_iarchive&, unsigned int)' Schedule.o: In function `boost::archive::detail::iserializer<CMyText_iarchive, GERINFO>::load_object_data(boost::archive::detail::basic_iarchive&, void*, unsigned int) const': Schedule.cpp:(.text._ZNK5boost7archive6detail11iserializerI16CMyText_iarchive11GERINFOE16load_object_dataERNS1_14basic_iarchiveEPvj[_ZNK5boost7archive6detail11iserializerI16CMyText_iarchive11GERINFOE16load_object_dataERNS1_14basic_iarchiveEPvj]+0x4b): undefined reference to `void GERINFO::serialize<CMyText_iarchive>(CMyText_iarchive&, unsigned int)' Images.o: In function `boost::archive::detail::iserializer<CMyText_iarchive, MNTINFO>::load_object_data(boost::archive::detail::basic_iarchive&, void*, unsigned int) const': Images.cpp:(.text._ZNK5boost7archive6detail11iserializerI16CMyText_iarchive9MNTINFOE16load_object_dataERNS1_14basic_iarchiveEPvj[_ZNK5boost7archive6detail11iserializerI16CMyText_iarchive9MNTINFOE16load_object_dataERNS1_14basic_iarchiveEPvj]+0x4b): undefined reference to `void MNTINFO::serialize<CMyText_iarchive>(CMyText_iarchive&, unsigned int)' Images.o: In function `boost::archive::detail::iserializer<CMyText_iarchive, VOLUMEINFO>::load_object_data(boost::archive::detail::basic_iarchive&, void*, unsigned int) const': Images.cpp:(.text._ZNK5boost7archive6detail11iserializerI16CMyText_iarchive13VOLUMEINFOE16load_object_dataERNS1_14basic_iarchiveEPvj[_ZNK5boost7archive6detail11iserializerI16CMyText_iarchive13VOLUMEINFOE16load_object_dataERNS1_14basic_iarchiveEPvj]+0x4b): undefined reference to `void VOLUMEINFO::serialize<CMyText_iarchive>(CMyText_iarchive&, unsigned int)' Info.o: In function `boost::archive::detail::oserializer<CMyText_oarchive, MAPPINGINFO>::save_object_data(boost::archive::detail::basic_oarchive&, void const*) const': Info.cpp:(.text._ZNK5boost7archive6detail11oserializerI16CMyText_oarchive14MAPPINGINFOE16save_object_dataERNS1_14basic_oarchiveEPKv[_ZNK5boost7archive6detail11oserializerI16CMyText_oarchive14MAPPINGINFOE16save_object_dataERNS1_14basic_oarchiveEPKv]+0x5a): undefined reference to `void MAPPINGINFO::serialize<CMyText_oarchive>(CMyText_oarchive&, unsigned int)' Info.o: In function `boost::archive::detail::iserializer<CMyText_iarchive, MAPPINGINFO>::load_object_data(boost::archive::detail::basic_iarchive&, void*, unsigned int) const': Info.cpp:(.text._ZNK5boost7archive6detail11iserializerI16CMyText_iarchive14MAPPINGINFOE16load_object_dataERNS1_14basic_iarchiveEPvj[_ZNK5boost7archive6detail11iserializerI16CMyText_iarchive14MAPPINGINFOE16load_object_dataERNS1_14basic_iarchiveEPvj]+0x4b): undefined reference to `void MAPPINGINFO::serialize<CMyText_iarchive>(CMyText_iarchive&, unsigned int)' make[1]: *** [service] Error 1 make[1]: Leaving directory `/home/gary/product_100/CoreService' make: *** [all] Error 1

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[container] vector::resize() - value-initialization vs default-initialization
by Adam Romanek 16 Apr '14

16 Apr '14

Hi! first, I'd like to focus on Boost 1.54. The documentation of boost::container::vector::resize(size_type) says the elements are *default constructed* [1]. The same applies to the respective constructor: boost::container::vector(size_type n). This is a significant deviation from what C++11 std::vector::resize(size_type) does as it *value-initializes* the new elements. Is the documentation of Boost.Container wrong in this case? Or the behavior of the container differs from the one defined by the standard? On the other hand in Boost 1.55 I see some changes related to the way elements are constructed (not mentioned in the release note). A new constructor and resize() method were added taking default_init_t to indicate default construction of new elements is desired. However, the documentation of boost::container::resize(size_type new_size, default_init_t) says the new elements are value initialized [2]. Note that the documentation of the respective constructor is correct and says the elements are default constructed. I also assume that the addition of the new constructor/resize method changed the behavior of the original constructor/resize method to be compliant with std::vector. Finally, @Ion: thanks for your good work on this library. I use it more and more often as it provides great features, useful especially in C++03 environments. If you want me to file any tickets on the above-mentioned issues please just say so. WBR, Adam Romanek [1] http://www.boost.org/doc/libs/1_54_0/doc/html/boost/container/vector.html#i… [2] http://www.boost.org/doc/libs/1_55_0/doc/html/vector.html#idp20954152-bb

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Build boost on OSX 10.9 with GCC 4.8
by Jürgen Simon 16 Apr '14

16 Apr '14

Hello, I have a somewhat specific problem. I need to build Boost 1.55 with the GCC 4.8 compiler on the mac. I have installed gcc-4.8 using homebrew. Using the GCC compiler instead of clang is non-negotiable in my case, because I require OpenMP which is not implemented in clang yet. Given that, I tried to build boost this way: export CC=/usr/local/Cellar/gcc48/4.8.2/bin/gcc-4.8 export CXX=/usr/local/Cellar/gcc48/4.8.2/bin/g++-4.8 export LD=/usr/local/Cellar/gcc48/4.8.2/bin/g++-4.8 ./bootstrap.sh —with-toolset=gcc-4.8 gives an error: Building Boost.Build engine with toolset gcc-4.8... Failed to build Boost.Build build engine Consult 'bootstrap.log' for more details apparently it does not recognize the gcc-4.8 toolkit. Using gcc instead does create the b2 script, but running the script as is also created trouble: ./bootstrap.sh —with-toolset=gcc ./b2 common.mkdir bin.v2/libs/atomic/build/gcc-4.2.1 common.mkdir bin.v2/libs/atomic/build/gcc-4.2.1/release common.mkdir bin.v2/libs/atomic/build/gcc-4.2.1/release/threading-multi gcc.compile.c++ bin.v2/libs/atomic/build/gcc-4.2.1/release/threading-multi/lockpool.o In file included from libs/atomic/src/lockpool.cpp:3: In file included from ./boost/atomic.hpp:12: In file included from ./boost/atomic/atomic.hpp:17: In file included from ./boost/atomic/detail/platform.hpp:22: ./boost/atomic/detail/gcc-atomic.hpp:961:64: error: no matching constructor for initialization of 'storage_type' (aka 'boost::atomics::detail::storage128_type') explicit base_atomic(value_type const& v) BOOST_NOEXCEPT : v_(0) specifying the toolkit gcc-4.8 here does actually do something: ./bootstrap.sh —with-toolset=gcc ./b2 -d 2 toolset=gcc-4.8 but it results in linker errors, like the following two examples: "g++-4.8" -Wl,-R -Wl,"/System/Library/Frameworks/Python.framework/Versions/2.7/lib" -Wl,-R -Wl,"/System/Library/Frameworks/Python.framework/Versions/2.7/lib/python2.7/config" -o "stage/lib/libboost_iostreams.dylib" -Wl,-h -Wl,libboost_iostreams.dylib -shared -Wl,--start-group "bin.v2/libs/iostreams/build/gcc-4.8/release/threading-multi/file_descriptor.o" "bin.v2/libs/iostreams/build/gcc-4.8/release/threading-multi/mapped_file.o" "bin.v2/libs/iostreams/build/gcc-4.8/release/threading-multi/bzip2.o" -Wl,-Bstatic -Wl,-Bdynamic -lbz2 -Wl,--end-group ld: unknown option: -R "g++-4.8" -o "bin.v2/libs/atomic/build/gcc-4.8/release/threading-multi/libboost_atomic.dylib" -Wl,-h -Wl,libboost_atomic.dylib -shared -Wl,--start-group "bin.v2/libs/atomic/build/gcc-4.8/release/threading-multi/lockpool.o" -Wl,-Bstatic -Wl,-Bdynamic -Wl,--end-group ld: unknown option: -h I tried for two days without success to get GCC-4.8 and Boost to play ball together on the Mac. What am I missing? Kind Regards, Jürgen

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can not compile nearest neighbors in d dimensions
by Georgios Samaras 16 Apr '14

16 Apr '14

I can not create a point in d(in the code M is dimensions) dimensions. The error is this: error: the value of ‘M’ is not usable in a constant expression note: ‘int M’ is not const error: template argument 2 is invalid and the line is this: int M; .. typedef bg::model::point<float, M, bg::cs::cartesian> point; Then, I am trying to create an Rtree (I have already the data in a 2D array), like this: // create the rtree using default constructor bgi::rtree< point, bgi::quadratic<16> > rtree; point tmp; for ( unsigned i = 0 ; i < N ; ++i ) { // insert new value for(int j = 0 ; j < M ; ++j) { bg::set<M>(tmp, a[i][j]); } rtree.insert(tmp); } and I think the error is in insert(). I am attaching a file with the minimal code and one with the errors I receive (I receive another one too). I am struggling to achieve that all day long. :/

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Interprenting nearest's neighbor's output
by Georgios Samaras 15 Apr '14

15 Apr '14

I am running the code found here http://www.boost.org/doc/libs/1_54_0_beta1/libs/geometry/doc/html/geometry/… (not the intersect query, only the nn). The output is this: " knn query point: POINT(0 0) knn query result: POLYGON((4 4,4 4.5,4.5 4.5,4.5 4,4 4)) - 4 POLYGON((3 3,3 3.5,3.5 3.5,3.5 3,3 3)) - 3 POLYGON((2 2,2 2.5,2.5 2.5,2.5 2,2 2)) - 2 POLYGON((0 0,0 0.5,0.5 0.5,0.5 0,0 0)) - 0 POLYGON((1 1,1 1.5,1.5 1.5,1.5 1,1 1)) - 1 " What are the integers on the right? Indices of the polygons? Actually is not really clear to me what are we inserting in the tree..I tried finding some documentation on these methods, but I only found info on how to call them... What I want, is simply inserting some points in the tree and then search for nn of a query point. Thanks in advance, George

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[Boost-Interprocess] Suggested approach for message_queue with dynamically sized messages
by Rob Conde 14 Apr '14

14 Apr '14

I want to use boost::interprocess and message_queue...however, the need to specify a max message size is an inhibitor because my message data doesn't necessarily have a limit in size. What is the suggested approach for this scenario? The best I can think of at the moment is to have a "start object" and "stop object" message, and then a "data" message. Then I just send the object in chunks of max_msg_size and reconstitute on the other side. This is all quite possible of course, but if there was a prescribed way to handle this without opening myself to these complexities it would be nice. Thanks in advance, Rob Conde

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Boost Universal Build
by •°o.O sαмι O.o°• 14 Apr '14

14 Apr '14

Hi, I am trying to build boost for all Mac platforms universally, I am having PPC and Intel architecture both. I am using this command to build boost 1_46_1. * ./bjam architecture=combined address-model=32_64 * and got following errors for almost every file: *./boost/python/detail/make_tuple.hpp:25: error: no matching function for call to \'91incref(<type error>)\'92\./boost/python/detail/make_tuple.hpp:25: error: \'91class boost::python::tuple\'92 has no member named \'91ptr\'92\ ./boost/python/detail/make_tuple.hpp:25: error: there are no arguments to \'91PyTuple_SET_ITEM\'92 that depend on a template parameter, so a declaration of \'91PyTuple_SET_ITEM\'92 must be available\* and "g++" -ftemplate-depth-128 -O3 -finline-functions -Wno-inline -Wall -dynamic -no-cpp-precomp -gdwarf-2 -Wno-long-double -fPIC -arch i386 -arch ppc -arch x86_64 -DBOOST_ALL_NO_LIB=1 -DBOOST_PYTHON_SOURCE -DNDEBUG -I"." -I"/System/Library/Frameworks/Python.framework/Versions/2.6/include/python2.6" -c -o "bin.v2/libs/python/build/darwin-4.0.1/release/address-model-32_64/architecture-combined/threading-multi/object/stl_iterator.o" "libs/python/src/object/stl_iterator.cpp"\ \ *...failed darwin.compile.c++ bin.v2/libs/python/build/darwin-4.0.1/release/address-model-32_64/architecture-combined/threading-multi/object/stl_iterator.o...\* please help me out if I am doing anything wrong or there is any other way of doing this. kind regards;

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Re: [Boost-users] Is selective header including supposed to work?
by Johannes Lorenz 14 Apr '14

14 Apr '14

Joel de Guzman wrote: > It should work, but the savings in compile time will be minimal. > If you want to reduce compile and build time, follow the example > in the compiler tutorial from calc7 up. The trick is to modularize > your grammars and put the definitions in separate cpp files (TUs). I think I start getting how it works. However, the dependency between statement and expression is not circular in calc7: expression seems to have no knowledge about statement. So if my dependency is circular (like e.g. expression and factor in calc2_ast), is it possible to separate them, as you suggest? Also, is there any documentation for calc7 or about TUs (what does TU mean?)? Again, many thanks for your kind answers.

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Call for Papers for Meeting C++ 2014 - one more week
by Jens Weller 13 Apr '14

13 Apr '14

Hello boost community, there is one week left to submit your talk to Meeting C++ 2014: http://meetingcpp.com/index.php/submit-your-talk.html Newsentry at Meeting C++ http://meetingcpp.com/index.php/newsreader/items/call-for-papers-one-more-w… So far 20 talks are submitted, a few of them also cover boost, most C++11/Modern C++. I also could announce the keynotes yesterday: Opening Keynote - Scott Meyers Closing Keynote - Hartmut Kaiser thanks, Jens

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phoenix bind vs boost bind?
by Robert Dailey 13 Apr '14

13 Apr '14

First of all, I'm using boost 1.55.0 on MSVC9. I've been using boost::phoenix in various places in my code base for easier usage of std::for_each and friends. However, I do not create lazy functions for a lot of the functions I bind to because they are only needed in one place most of the time. As a result, I use boost::phoenix::bind the same as I'd use boost::bind(). However I have read in various places that boost::bind is being deprecated. I'm not sure if there is truth to this, but is there a reason to choose one over the other? Is phx::bind() basically an "upgrade" to boost::bind? If I intermingle them, I have a lot of issues out of placeholder ambiguities that results in more boilerplate code (i.e. using boost::phoenix::placeholders::_1 everywhere). Any tips? I haven't used boost in a few years so I just want to make sure I'm not using it incorrectly. Thanks in advance.

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Is selective header including supposed to work?
by Johannes Lorenz 12 Apr '14

12 Apr '14

Hello, I like Qi, but the compile times are terrible sometimes. My example is similar to this in [1], but it needs 3x as much time to compile. I thought this problem might be omitted by including selectively what is needed. So I went into [1] and replaced #include <boost/spirit/include/qi.hpp> by #include <boost/spirit/include/qi_action.hpp> #include <boost/spirit/include/qi_grammar.hpp> #include <boost/spirit/include/qi_uint.hpp> #include <boost/spirit/include/qi_char.hpp> . I got far, but then, there comes up a long error message, beginning like in [2]. My questions are: * is selectively including from "boost/spirit/include" supposed to work, or should this never be done? * if it should work, what is still left to be included in my case? My version of boost is 1.53. Many thanks on advance. Kind regards, Johannes [1] http://www.boost.org/doc/libs/1_41_0/libs/spirit/example/qi/calc2_ast.cpp [2] [...]/usr/include/boost/spirit/home/qi/nonterminal/rule.hpp:176:13: error: no matching function for call to ‘assertion_failed[...] /usr/include/boost/spirit/home/qi/nonterminal/rule.hpp:176:13: note: candidate is: /usr/include/boost/mpl/assert.hpp:79:5: note: template<bool C> int mpl_::assertion_failed(typename mpl_::assert<C>::type) int assertion_failed( typename assert<C>::type ); ^ /usr/include/boost/mpl/assert.hpp:79:5: note: template argument deduction/substitution failed:[...]

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Re: [Boost-users] Is selective header including supposed to work?
by Johannes Lorenz 12 Apr '14

12 Apr '14

Hi, > #include <boost/spirit/include/qi_operator.hpp> sadly, it did not. It did for the AST example, but it does not for mine I uploaded the code on github [3 (mostly) and 4]. Can you please help me with this file? Is there any generic approach if you hit such errors? > BTW, if you care about the compile time, there's Spirit X3 in develope > which utilizes c++11/14 and it claims to compile faster. I am really looking forward to this Regards, Johannes [3] https://github.com/JohannesLorenz/sca-toolsuite/blob/master/src/res/equatio… [4] https://github.com/JohannesLorenz/sca-toolsuite/blob/master/src/res/equatio…

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Building Boost from Modular Boost Repository
by Baptiste Wicht 11 Apr '14

11 Apr '14

Hi, I wanted to test some experimental features of Boost Spirit X3, so I tried to install Boost from the "Modular Boost" Git repository, but without success. I followed the instructions on https://svn.boost.org/trac/boost/wiki/TryModBoost and the b2 command failed: /home/wichtounet/src/modular-boost/tools/build/src/build/feature.jam:493: > in feature.validate-value-string from module feature > error: "none" is not a known value of feature <optimization> > error: legal values: "off" "speed" "space" > /home/wichtounet/src/modular-boost/tools/build/src/build/property.jam:273: > in validate1 from module property > /home/wichtounet/src/modular-boost/tools/build/src/build/property.jam:299: > in property.validate from module property > /home/wichtounet/src/modular-boost/tools/build/src/tools/builtin.jam:377: > in variant from module builtin > /usr/share/boost-build/site-config.jam:9: in modules.load from module > site-config > /home/wichtounet/src/modular-boost/tools/build/src/build-system.jam:249: > in load-config from module build-system > /home/wichtounet/src/modular-boost/tools/build/src/build-system.jam:351: > in load-configuration-files from module build-system > /home/wichtounet/src/modular-boost/tools/build/src/build-system.jam:524: > in load from module build-system > /home/wichtounet/src/modular-boost/tools/build/src/kernel/modules.jam:289: > in import from module modules > /home/wichtounet/src/modular-boost/tools/build/src/kernel/bootstrap.jam:139: > in boost-build from module > /home/wichtounet/src/modular-boost/boost-build.jam:17: in module scope > from module > I tried adding optimization=speed on the command line, but it didn't changed a thing. I tried the master and develop branches. Is there some configuration that is necessary ? Or is there another procedure to follow ? Thanks -- Baptiste Wicht, HES-SO University of applied Sciences My personal website - http://baptiste-wicht.com

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